20 Most Recent 1990 Lexus LS 400 - Page 6 Questions & Answers

sounds something like o2 sensor?
Best reguards, Premium FixYa Team

One or more of the pulleys is out of line or the idler or tensioner is defective and coming apart, the best thing to do is have them all pulleys checked for misalignment to stop this, many times the crankshaft pulley separates from the rubber ring that dampens crankshaft vibrations and the pulley walks outward. It takes a trained eye to see these pulley alignment issues, suggest you have a trusted shop look at this for you. Even a slight misalignment will eat up or throw off the belt.

take out the back seat.

You need to test your Engine Control Unit (ECU) for fault codes.
This could be caused by several things:
- Coolant Temperature Sensor or circuit
- Intake Air Temperature Sensor or circuit
- A/C Signal circuit
- Power Steering Pressure sensor or circuit.
- Neutral Start Switch circuit
- Throttle Position Sensor or circuit
- Idle Control Valve or circuits
- ECU

You can check fault codes by placing a jumper between terminals E1 and TE1 in the check connector.
(See pictures below) Turn the ignition switch on and count the flashes of the Check Engine light.

If it flashes 2 times every second, this is normal (No codes present). If a fault code is present, the first group of flashes is the first digit in the 2-digit code. There will then be a 1.5 second delay and the second digit will be output. If there is more than 1 code present, there will be a 2.5 second delay, then the nexy code will begin tobe output.
It is recommended that you read the codes (flashes) several times to make sure you are reading them correctly.

Here you can find the guide about how to How to Change Valve Cover Gaskets 1990-1994 Lexus LS400 (images included).

You have one legend vehicle, so, its possible that you are interesting in obtain the Repair Manual.

Keep us updated.

Should be a release lever on the underside of the dash to the left of the steering wheel. It should be flush with the panel, so you might have to feel around for it. Hope that helps...!

On both sides of the headrest spokes are little adjuster rings. Adjust the headrest up to the highest position. Push down on both of the adjuster rings. While doing that, pull up on the headrest and it will pop right up. Here is a link to help you with all other questions: http://www.clublexus.com/forums/ls400/18383-trying-to-remove-front-seat-headrest-on-ls400-dont-want-to-break-it.html

Thanks for choosing FixYa and welcome to the site. You need to make sure that your fuse is good. The fuse may be blown. Next, if the fuse is good, you may have a bad wire or a bad fan. You will need to test the wires with a voltage meter to determine which one it is. If the fan is getting power, the fan is bad. If it is not, it is a bad wire.

the head rest built inside the seat, you have to take car to a upholstery shop, to replace head rest. best to keep head rest because head rest was made with the seat to keep head neck stable in case of a car accident.the head rest keep you from getting broken neck on a hand on impact.head rest was made for your safety also seat belts. you need them both.

Hi again,

Any developments with your Lexus?

fuel gauge don't work sound like the fuel sending sensor is bad ,and the speedometer check your fuses under hood ,also check that the speedometer cable is not loose from transmission

Make sure the battery is fully charged. Try jumping it or using a jumper box.

The fuel gauge is control by the pump assembly in the tank. You would have to replace the fuel pump assembly to correct the issue.

You will need to disable the alarm.